CVE-2026-46242 (GCVE-0-2026-46242)

Vulnerability from cvelistv5 – Published: 2026-05-30 12:13 – Updated: 2026-07-24 14:33
VLAI
Title
eventpoll: fix ep_remove struct eventpoll / struct file UAF
Summary
In the Linux kernel, the following vulnerability has been resolved: eventpoll: fix ep_remove struct eventpoll / struct file UAF ep_remove() (via ep_remove_file()) cleared file->f_ep under file->f_lock but then kept using @file inside the critical section (is_file_epoll(), hlist_del_rcu() through the head, spin_unlock). A concurrent __fput() taking the eventpoll_release() fastpath in that window observed the transient NULL, skipped eventpoll_release_file() and ran to f_op->release / file_free(). For the epoll-watches-epoll case, f_op->release is ep_eventpoll_release() -> ep_clear_and_put() -> ep_free(), which kfree()s the watched struct eventpoll. Its embedded ->refs hlist_head is exactly where epi->fllink.pprev points, so the subsequent hlist_del_rcu()'s "*pprev = next" scribbles into freed kmalloc-192 memory. In addition, struct file is SLAB_TYPESAFE_BY_RCU, so the slot backing @file could be recycled by alloc_empty_file() -- reinitializing f_lock and f_ep -- while ep_remove() is still nominally inside that lock. The upshot is an attacker-controllable kmem_cache_free() against the wrong slab cache. Pin @file via epi_fget() at the top of ep_remove() and gate the critical section on the pin succeeding. With the pin held @file cannot reach refcount zero, which holds __fput() off and transitively keeps the watched struct eventpoll alive across the hlist_del_rcu() and the f_lock use, closing both UAFs. If the pin fails @file has already reached refcount zero and its __fput() is in flight. Because we bailed before clearing f_ep, that path takes the eventpoll_release() slow path into eventpoll_release_file() and blocks on ep->mtx until the waiter side's ep_clear_and_put() drops it. The bailed epi's share of ep->refcount stays intact, so the trailing ep_refcount_dec_and_test() in ep_clear_and_put() cannot free the eventpoll out from under eventpoll_release_file(); the orphaned epi is then cleaned up there. A successful pin also proves we are not racing eventpoll_release_file() on this epi, so drop the now-redundant re-check of epi->dying under f_lock. The cheap lockless READ_ONCE(epi->dying) fast-path bailout stays.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: a1f93804449d13f97dabd4b996817de4bf1ed67a , < 3e1144d2515d28e4312e663ea05eac203101491d (git)
Affected: 58c9b016e12855286370dfb704c08498edbc857a , < 2de4db145b2992da496fea6c51f9839be678ae24 (git)
Affected: 58c9b016e12855286370dfb704c08498edbc857a , < 9324de74a3a59b9fde9b62ee45ebaa71458ba2e5 (git)
Affected: 58c9b016e12855286370dfb704c08498edbc857a , < ef4ca02e95363e78977ca04340d44fe3b4b2b81f (git)
Affected: 58c9b016e12855286370dfb704c08498edbc857a , < ced39b6a8062bac5c18a1c3df85634107eb8664a (git)
Affected: 58c9b016e12855286370dfb704c08498edbc857a , < a6dc643c69311677c574a0f17a3f4d66a5f3744b (git)
Affected: f2451def095c1743adcfcb0cb5dadc86034e162a (git)
Affected: 6.1.175 , < 6.1.178 (semver)
Affected: 5.15.209 , < 5.16 (semver)
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Linux Linux Affected: 6.4
Unaffected: 0 , < 6.4 (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.144 , ≤ 6.6.* (semver)
Unaffected: 6.12.95 , ≤ 6.12.* (semver)
Unaffected: 6.18.33 , ≤ 6.18.* (semver)
Unaffected: 7.0.10 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\neventpoll: fix ep_remove struct eventpoll / struct file UAF\n\nep_remove() (via ep_remove_file()) cleared file-\u003ef_ep under\nfile-\u003ef_lock but then kept using @file inside the critical section\n(is_file_epoll(), hlist_del_rcu() through the head, spin_unlock).\nA concurrent __fput() taking the eventpoll_release() fastpath in\nthat window observed the transient NULL, skipped\neventpoll_release_file() and ran to f_op-\u003erelease / file_free().\n\nFor the epoll-watches-epoll case, f_op-\u003erelease is\nep_eventpoll_release() -\u003e ep_clear_and_put() -\u003e ep_free(), which\nkfree()s the watched struct eventpoll. Its embedded -\u003erefs\nhlist_head is exactly where epi-\u003efllink.pprev points, so the\nsubsequent hlist_del_rcu()\u0027s \"*pprev = next\" scribbles into freed\nkmalloc-192 memory.\n\nIn addition, struct file is SLAB_TYPESAFE_BY_RCU, so the slot\nbacking @file could be recycled by alloc_empty_file() --\nreinitializing f_lock and f_ep -- while ep_remove() is still\nnominally inside that lock. The upshot is an attacker-controllable\nkmem_cache_free() against the wrong slab cache.\n\nPin @file via epi_fget() at the top of ep_remove() and gate the\ncritical section on the pin succeeding. With the pin held @file\ncannot reach refcount zero, which holds __fput() off and\ntransitively keeps the watched struct eventpoll alive across the\nhlist_del_rcu() and the f_lock use, closing both UAFs.\n\nIf the pin fails @file has already reached refcount zero and its\n__fput() is in flight. Because we bailed before clearing f_ep,\nthat path takes the eventpoll_release() slow path into\neventpoll_release_file() and blocks on ep-\u003emtx until the waiter\nside\u0027s ep_clear_and_put() drops it. The bailed epi\u0027s share of\nep-\u003erefcount stays intact, so the trailing ep_refcount_dec_and_test()\nin ep_clear_and_put() cannot free the eventpoll out from under\neventpoll_release_file(); the orphaned epi is then cleaned up\nthere.\n\nA successful pin also proves we are not racing\neventpoll_release_file() on this epi, so drop the now-redundant\nre-check of epi-\u003edying under f_lock. The cheap lockless\nREAD_ONCE(epi-\u003edying) fast-path bailout stays."
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      "date": "2026-07-31",
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      "cve": "CVE-2026-46242",
      "id": "msrc_CVE-2026-46242",
      "initial_release_date": "2026-05-02T00:00:00.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "1",
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      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "eventpoll: fix ep_remove struct eventpoll / struct file UAF",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-46242.json",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2026-46242\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-05-30T13:16:21.980\",\"lastModified\":\"2026-07-24T15:17:22.733\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\neventpoll: fix ep_remove struct eventpoll / struct file UAF\\n\\nep_remove() (via ep_remove_file()) cleared file-\u003ef_ep under\\nfile-\u003ef_lock but then kept using @file inside the critical section\\n(is_file_epoll(), hlist_del_rcu() through the head, spin_unlock).\\nA concurrent __fput() taking the eventpoll_release() fastpath in\\nthat window observed the transient NULL, skipped\\neventpoll_release_file() and ran to f_op-\u003erelease / file_free().\\n\\nFor the epoll-watches-epoll case, f_op-\u003erelease is\\nep_eventpoll_release() -\u003e ep_clear_and_put() -\u003e ep_free(), which\\nkfree()s the watched struct eventpoll. Its embedded -\u003erefs\\nhlist_head is exactly where epi-\u003efllink.pprev points, so the\\nsubsequent hlist_del_rcu()\u0027s \\\"*pprev = next\\\" scribbles into freed\\nkmalloc-192 memory.\\n\\nIn addition, struct file is SLAB_TYPESAFE_BY_RCU, so the slot\\nbacking @file could be recycled by alloc_empty_file() --\\nreinitializing f_lock and f_ep -- while ep_remove() is still\\nnominally inside that lock. The upshot is an attacker-controllable\\nkmem_cache_free() against the wrong slab cache.\\n\\nPin @file via epi_fget() at the top of ep_remove() and gate the\\ncritical section on the pin succeeding. With the pin held @file\\ncannot reach refcount zero, which holds __fput() off and\\ntransitively keeps the watched struct eventpoll alive across the\\nhlist_del_rcu() and the f_lock use, closing both UAFs.\\n\\nIf the pin fails @file has already reached refcount zero and its\\n__fput() is in flight. Because we bailed before clearing f_ep,\\nthat path takes the eventpoll_release() slow path into\\neventpoll_release_file() and blocks on ep-\u003emtx until the waiter\\nside\u0027s ep_clear_and_put() drops it. The bailed epi\u0027s share of\\nep-\u003erefcount stays intact, so the trailing ep_refcount_dec_and_test()\\nin ep_clear_and_put() cannot free the eventpoll out from under\\neventpoll_release_file(); the orphaned epi is then cleaned up\\nthere.\\n\\nA successful pin also proves we are not racing\\neventpoll_release_file() on this epi, so drop the now-redundant\\nre-check of epi-\u003edying under f_lock. The cheap lockless\\nREAD_ONCE(epi-\u003edying) fast-path bailout stays.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\\n\\neventpoll: correcci\u00f3n de UAF de struct eventpoll / struct file en ep_remove\\n\\nep_remove() (a trav\u00e9s de ep_remove_file()) limpi\u00f3 file-\u003ef_ep bajo file-\u003ef_lock pero luego sigui\u00f3 usando @file dentro de la secci\u00f3n cr\u00edtica (is_file_epoll(), hlist_del_rcu() a trav\u00e9s del encabezado, spin_unlock). Un __fput() concurrente que tomaba la ruta r\u00e1pida de eventpoll_release() en esa ventana observ\u00f3 el NULL transitorio, omiti\u00f3 eventpoll_release_file() y se ejecut\u00f3 a f_op-\u003erelease / file_free().\\n\\nPara el caso de epoll-observa-epoll, f_op-\u003erelease es ep_eventpoll_release() -\u003e ep_clear_and_put() -\u003e ep_free(), que libera con kfree() la struct eventpoll observada. Su hlist_head -\u003erefs incrustada es exactamente donde apunta epi-\u003efllink.pprev, por lo que el \\\"*pprev = next\\\" del hlist_del_rcu() subsiguiente escribe en memoria kmalloc-192 liberada.\\n\\nAdem\u00e1s, struct file es SLAB_TYPESAFE_BY_RCU, por lo que el slot que respalda a @file podr\u00eda ser reciclado por alloc_empty_file() -- reinicializando f_lock y f_ep -- mientras ep_remove() todav\u00eda est\u00e1 nominalmente dentro de ese bloqueo. El resultado es un kmem_cache_free() controlable por un atacante contra la cach\u00e9 de slab incorrecta.\\n\\nFija @file a trav\u00e9s de epi_fget() al inicio de ep_remove() y condiciona la secci\u00f3n cr\u00edtica al \u00e9xito de la fijaci\u00f3n. Con la fijaci\u00f3n mantenida, @file no puede alcanzar un recuento de referencias de cero, lo que evita que __fput() se ejecute y mantiene transitivamente viva la struct eventpoll observada a trav\u00e9s del hlist_del_rcu() y el uso de f_lock, cerrando ambas UAFs.\\n\\nSi la fijaci\u00f3n falla, @file ya ha alcanzado un recuento de referencias de cero y su __fput() est\u00e1 en curso. Debido a que abortamos antes de limpiar f_ep, esa ruta toma la ruta lenta de eventpoll_release() hacia eventpoll_release_file() y se bloquea en ep-\u003emtx hasta que el ep_clear_and_put() del lado del esperador lo suelta. La parte de ep-\u003erefcount del epi abortado permanece intacta, por lo que el ep_refcount_dec_and_test() final en ep_clear_and_put() no puede liberar el eventpoll por debajo de eventpoll_release_file(); el epi hu\u00e9rfano es entonces limpiado all\u00ed.\\n\\nUna fijaci\u00f3n exitosa tambi\u00e9n prueba que no estamos compitiendo con eventpoll_release_file() en este epi, por lo que se elimina la ahora redundante nueva verificaci\u00f3n de epi-\u003edying bajo f_lock. La salida r\u00e1pida barata sin bloqueo de READ_ONCE(epi-\u003edying) permanece.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/eventpoll.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"a1f93804449d13f97dabd4b996817de4bf1ed67a\",\"lessThan\":\"3e1144d2515d28e4312e663ea05eac203101491d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"58c9b016e12855286370dfb704c08498edbc857a\",\"lessThan\":\"2de4db145b2992da496fea6c51f9839be678ae24\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"58c9b016e12855286370dfb704c08498edbc857a\",\"lessThan\":\"9324de74a3a59b9fde9b62ee45ebaa71458ba2e5\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"58c9b016e12855286370dfb704c08498edbc857a\",\"lessThan\":\"ef4ca02e95363e78977ca04340d44fe3b4b2b81f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"58c9b016e12855286370dfb704c08498edbc857a\",\"lessThan\":\"ced39b6a8062bac5c18a1c3df85634107eb8664a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"58c9b016e12855286370dfb704c08498edbc857a\",\"lessThan\":\"a6dc643c69311677c574a0f17a3f4d66a5f3744b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f2451def095c1743adcfcb0cb5dadc86034e162a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6.1.175\",\"lessThan\":\"6.1.178\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"5.15.209\",\"lessThan\":\"5.16\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/eventpoll.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.4\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.4\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.178\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.144\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.95\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.33\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.10\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-416\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.15.209\",\"versionEndExcluding\":\"5.16\",\"matchCriteriaId\":\"DA466B5F-044E-47F0-A6CE-AB474F8A9361\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.1.175\",\"versionEndExcluding\":\"6.2\",\"matchCriteriaId\":\"67892698-2698-487E-B4D2-EFCD2D933D19\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.4\",\"versionEndExcluding\":\"6.18.33\",\"matchCriteriaId\":\"51601BBF-BF40-48AF-8132-2582D7E56D71\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.19\",\"versionEndExcluding\":\"7.0.10\",\"matchCriteriaId\":\"A13475D2-59BF-4716-94B5-7C1D239A2CF4\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/2de4db145b2992da496fea6c51f9839be678ae24\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3e1144d2515d28e4312e663ea05eac203101491d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9324de74a3a59b9fde9b62ee45ebaa71458ba2e5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a6dc643c69311677c574a0f17a3f4d66a5f3744b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/ced39b6a8062bac5c18a1c3df85634107eb8664a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/ef4ca02e95363e78977ca04340d44fe3b4b2b81f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"http://www.openwall.com/lists/oss-security/2026/07/08/14\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-07-29T16:23:49+00:00",
      "cve": "CVE-2026-46242",
      "id": "CVE-2026-46242",
      "initial_release_date": "2026-05-30T00:00:00+00:00",
      "product_status:fixed": "1603",
      "product_status:known_not_affected": "112",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: eventpoll: fix ep_remove struct eventpoll / struct file UAF",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46242.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-07-28T17:14:30Z",
      "cve": "CVE-2026-46242",
      "id": "CVE-2026-46242",
      "initial_release_date": "2026-05-31T01:32:25Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "411",
      "product_status:known_not_affected": "181",
      "product_status:recommended": "383",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-46242",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-46242.json",
      "version": "14"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.